Connection for filament and lead wires



Jan. 24, 1939. w. J. MEEKER ET AL 2,145,186

CONNECTiON FOR FILAMENT AND LEAD WIRES Filed July 1, 1938 I e V/ mmuwwmI M t n .R t 6 5 A mmm w TL Q WL T .W

Patented Jan. 24, 19 39 a I 4 UNI ED o v I CCONNVEOQTIIO'N I- Wells ,1.Meeker s a... min mal, out, r assignors to General Electrlc'Co npany, acorporatlon of New York p Application my 1, ma, Serial No. 211,000

3 Claims. 176-38) Our invention relates to incandescent lamps, standardbase l Additional support is provided radio tubes and other electricaldevices enclosed for the mid-portion of the filamentll by the within asealed bulb or cohtainenand more-par wire ll'which is looped thereaboutand has one ticularly to the attachment of the filament orend embeddedin the button on the end: of the 5 other resistance element of saiddevices to the glass arbor I! extending from the stem I 4." 5

inner leads thereof. In this particular instance the filament H is vUsually the filament or the resistance element of coiled-conform, asshown in Fig. 2, and has v of such electric devices is connected to theinner its singly coiled end portions 20 clamped in hooks 7 leads bymeans of hooks formed by bending back 2| formed on the ends of thelead-in wires l2 10 the end portions of said leads which are closed and13. Each hook 2|, as shown in the enlarged 10 on the ends of saidfilament or resistance. When view of lead-in l2 shown in Fig. 2, isformed from the ends of the filament are coiled, the hooks are aflattened, end portion of said lead-in wire closed only enough to holdtherfilament securely; which is bent back on itself and which, in thisin order to avoid crushing and probable injury instance, is provided onits inner surface with 1 l5 thereto. To close the-hooks the correctamount longitudinal ridges 22 which engage the turns of has, however;proven very diilicult and the said the end portion of the filament. Theridges 22 hooks are some timesnot closed tightly enough are notnecessarily spaced the same distance to hold the filament. Thiscondition occurs most apart as the coils of the end portion 20 of theoften when the filament and leads are brought filament but tend to holdsaid filament securely,

20 together manually and clamped. i since theylie approximately parallelto said coils 20 An object of our invention is to provide an and agoodly portion of said ridgesprojects beimproved joint between afilament and a lead-in V tween said coils. The hooks are not closedtight wire. Another object is to provide a lead-in wire 1y since thecoils of the filament ends 20 would with a filament-engaging hook soformed as to be crushed and very likely injured. However, the

. 25 hold the filament-securely and prevent injury said coils areusually flattened to acertain ex- 25 thereto even though the hook isclosed more or tent as shown in .Fig. 3. The ridges 22 in" the lesstightly than normally allowable. Another lead-in wires l2 and II, whichin this instance ,object is to provide a lead wire with afilamentarefmade of nickel, usually are also distorted engaging hookhaving its inner surface so formed somewhat by; the filament cells sothat a-, more I as to prevent slipping of the end of a coiledfilaelfective electrical connection is;v made. Both the; 30

ment therefrom without the necessity of gripping greater gripping"effect as well asjthe' resilience. the filament so tightly as to injureit. Other fea-, provided by theridgescontribute-to the superiortures andadvantages. 01* our invention will be ity of this type of hook sincethey insure that a apparent from the following detailed description moreloosely as well as a more tightly clamped of species thereof, andfromthe accompanying hookrwill hold the filament satisfactorily. 1. 35

. drawing. r Obviously other shapes and forms of protuber- In thedrawing Fig. lis a perspective view of ances or'roughenlng than theridges 22 may be an incandescent lamp embodyinga filament joint providedon the inner surfaces of the hooks 2|.

construction comprising our invention; Fig. 2 is The said surfaces ofthe hooks ma'y,for instance,

40 an enlarged perspective view showing one end of be knurled to providediamond-shaped protuber- 40 a filament joined to a lead wire inaccordance ances such as shown on the flattened end portion with ourinvention; Fig. 3 is a sectional view on 23 of the lead-in wire2l inFig: 4. The said end a still larger $08.18 0f the hooked end Of the leadporfiion' 23 is shown prior to its formation into a, wire with the endof the filament secured therein; hook, p

and Fig. 4 is an elevation. on 'an enlarged scale what w lai a ew a d dir t e ur by 45 of a portion of a lead wire having an end of LettersPatent of the United States is:

' modified form, said end being shown prior to its 1. In an electricaldevice comprising a sealed formation into a hook. 3 container, thecombination of a closely coiled The incandescent lamp shown in Fig. 1comfilament in said container and an inner leadof a'refractory metalsuch as tungsten. The filaon an end thereof clamped around a portion ofm. is conn c to h ner ends of the said filament, the innerfilament-engaging sur- Ieading-ln Wires-IZ and I3 which extend throughface of said hook being roughened to securely the conventional tiplessstem .II to the metal grip the turns of said filament.

55 shell I! and end eyelet l6 respectively, of the v 2. In an electricaldevice-comprisin 8 ea 56 pris bulb n in'which is sealed a filament llconnected thereto, said inner lead having a hook container, thecombination of a closely coiled filament in said container and an innerlead connected thereto, said. inner lead having a hook on an end thereofclamped around a portion of saidfilament, the inner filament-engagingsurface of said hook having protuberances thereon at least some of whichextend into the spaces between the turns of said filament to securelygrip 3. In an electrical device comprising a sealed cu ely zripp s t e

